Operation And Timing - Canon LBP-1120 Service Manual

OPERATION AND TIMING

This chapter describes the printer functions, the relationships between mechanisms and circuits, and the timing
of operations. Mechanical linkages are indicated by black and white lines (
signals by solid arrows (
There is a microcomputer in this printer. But as the internal operation of the microcomputer cannot be
checked, an explanation of the operation of the microcomputer has been left out.
As it is assumed that no repair will be made to customer circuit boards, the explanation of board circuits is
limited to an outline using block diagrams. So there are two types of circuit explanations; (1) everything from
the sensor to the input sections of the major circuit boards, (2) everything from the output sections of the major
circuit boards to the loads. These are explained with block diagrams according to the function.
I. BASIC OPERATION ............................. 2-1
II. ENGINE CONTROL SYSTEM .............. 2-4
III. LASER/SCANNER SYSTEM ................ 2-17
CHAPTER 2
), and the flow of groups of signals by outline arrows (
IV.
V.
VI.
IMAGE FORMATION SYSTEM ............ 2-23
PICK-UP/FEED SYSTEM ..................... 2-31
VIDEO CONTROL SYSTEM ................ 2-34
), the flow of control
).